Improvement in cut-offs for blast-furnaces



Nrrien rares PATENT Grrrcn.

HENRY DAVIES, OF NEWPORT, KENTUCKY.

HVBPRGVEEVEENT IN CUT-OFFS FOR BLAST-FURNACES.

trpecilicaton forming part oi' Letters Patent No. ll 3,7415, dated April 18, 1571.

To @ZZ whom, it may concern:

Be it known thatI, HENRY DavIEs, of Newport, in the county of Campbell and State of Kentucky, have invented a new and Improved Gut-Off for Blast-Furnaces; and I do hereby declare that the following is a full, clear, and exact description thereof, which Will enable others skilled in the art to make Vand use the same, reference being had to the accompanying drawings, forming part of this specification, in which- ,Figure l is a verticallongitudinal section of my invention. Fig. 2 is a plan view and partial horizontal section of the same. Fig. 3 is a side yelevation of the same, and Fig. 4 a transverse section of the cut-orf valve.

Similar letters of reference indicate corresponding parts.

This invention relates to a new mechanism for cutting 0E the blast for -the purpose of letting down the stock in blast-furnaces; and it consists in a new arrangement of valves and an entirely original combination of machinery for regulating the motion of said valves, as hereinafter' more fully described.

a is a valve-chamber; I), a double-beat valve;

.c, a double-valve seat, c, the pipe conveying the blast to the valve, and f the pipe conveying the blast to the tuycre of the furnace. g/ is the crank or lever for lifting and 7i the crank or lever for operating the same, both said cranks projecting from a shaft, j.

1When the blast is driven into the valvechamber fait will enter the valve-boxe at both bottom and top, as shown by the arrows in Fig. l, and escape at fto the tuyere.

The Power valve, t, is a little smaller than the upper valve, b, to allow its insertion in the valve-box; but both are cast in one piece, as shown in Fig. 4, a notch being cut in the connection for admitting the lever g.

The spindle j is cast in one piece with the lever g, and has a collar on the inner side of the valve-chamber, which is held against the face of the chamber bythe pressure of theblast to prevent leakage.

NVhen it is necessary to cut off the blast, I depress the lever h until the valve-faces come down upon their seats. The blast is then cut off from the pipe j', and will make its escape hot blast is used, should always be between the blowing-machine andthe heater.

The bracket 7.: for supporting one end of the spindlej, is cast to the valve-box c. The chamber c has one removable face-plate, m, which is secured by bolts. The box c is inserted, and can be removed when this door or faceplate is off. A flange, Z, on ckeeps itin place against the pipe f, while a i'lange, 11., on m` holds the other end of the box. In this manner the valve, with itslbox c and spindle j,vcan be taken out for repairs when necessary without disturbing the connection-pipes.

The machine to be driven by the pressure of air from the blast is composed of a blastcylinder, A, with its piston B, rod C, guide D, lever-beam E, shaft F, pump G, with its plunger H, guide I, escape-plug J, regulating-screw K, and inlet-valve L. 1

M is a spool-valve in the valve-chest N, and has by means of its projecting heads four faces, which lit against four corresponding seats, 3, 4, 5, and 6, in the valve-chest, but only against two at once. The valve M is in fact a doublebeat valve, both in its raised and lowered position, and is operated-by the rod O, lever l?, rod R, weight S, and arm T.

The cistern U is to supply the pump G with water.

The lever-beam E is connected to the pistonrod C by means of a sliding block upon awristpin in the lever fitting between two projections upon the guide D, as in Fig. 2. Thepnmp end of the lever carriesv a small roller iitted also upon a wrist-pin. The roller serves to raise the plunger H by catching under a proj ection, V, thereon, the lever being free to move in the opposite direction, leaving the plunger up, as shown in the drawings. It will also be seen that the lever l? has a projecting piece, Q, and the arm T has also a projection, 2.

Vhen the machine is in the position shown in Fig. l, the air from the blowing-machine will enter the valve-chest N at "W, following the direction of the arrows into the bottom of the cylinder A. The top of the piston B is open to the atmosphere by the channel 7. The plunger H has just been raised, and is resting on the water in the pump G, said water having been taken in through the valve L. Then through a loaded valvefixed upon the blasti the valve J is slightly raised, the plunger H pipe at any convenient place, which, when a l will descend slowlyby its own weight, together with the arm T and rod It, pressing the water out of the pump G through the opening at J l until the collar Y upon the rod R strikes the lever P. The motion of the rod R will then be stopped,while that of H continues, so that the arm T will slide loose on R, the lever P being kept from moving by the projection 2, which at this stage is in front of Q. As soon as the plunger H reaches the bottom of the pump, the arm T will have been so far lowered that the projection 2 will be below Q. The weight S is then liberated, and will immediately swing the lever P and raise the valve M against the upper faces, 3 and 5. This motion of the lever P will alsocarry Q over 2, when the valve M will be raised. The air-pressure is, by the change of valve M, brought on top of the piston B,while the lower air-channel, 8, is opened to the atmosphere. The piston B will now move down and will elevate the plunger H and its arm Tuntil the latter comes in contact With the lock-nut g on the rod R. Then said rod, together with its collar Y and weight S, will be raised again until they are at their full height, when the piece Qwill be liberated from 2, and the valve M fall by its own Weight, and the pressure is again under the piston B,which will be raised, leaving the plunger H again resting on the water, as before.

It will be seen that the heads of the cylinder A have hollow inward projections, and that the piston B has its central portion project on both sides, so that it will it easily into the openings in top and bottom of cylinder. The channels 7 and 8 lead into these openings. The bottom of the cylinder B has a small aperture, o, leading into thel channel 7. The aperture o may be stopped in part or altogether by means of a screw-plug, f. Vhen the piston descends, its lower central projection enters the hollow projection q and closes the port 7, separating that part of the same which has the opening ofroin the channel, and forming a cushion of air in the lower part of the cylinder, which will retard the final descent of the piston, keeping the projection 2 against Q. The machine is thereby nearly stationary, until the piston has forced the aircushion out through the opening o into the channel 7. The air-cushion on the upper end of cylinder is simply to prevent the piston from striking the top.

The automatic machine is connected to the cutoff by the crank- Z, rod X, and crank 7L. While the plunger H is going quietly down, the cut-off valve is open; but as soon as the plunger is down, the machine instantly closes, the cutoff pausing a little while the cushion gets away through o, as before described, and then reopens the valve. In this way the cutoff can be set by the screw-plug J, so as to work at suitable intervals. It will also be seen that this cuto' can be put in the hotblast pipe close to the furnace, where it will be very effective and quick, as there will be but'a small amount of air between it and the tuyere, andthe pressure beingkept up between the pipes and the hot-blast, the blast Will be at the tuyere again before the cinders can come back into the blow-pipe.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. The double-beat valve b, arranged within the case 0, and actuated by the crank g, to operate substantially as herein shown and described.

2. The pump-plunger H, provided with the projection V, so that it will he elevated bythe beam E, but descend only by its own weight, substantially as specified.

3.. The pump G, provided with the adjustable valve J, by which the discharge of water is regulated for allowing the descent of the plunger, as set forth. j

4. The arm T, arranged on the pump-plun ger, and provided with the projection 2 and loose rod R, to operate, by means of the attachments, substantially as herein-shown and described.

5. The valve-lever P, balanced at one side by the weighted rod R, and at the other by the valve M, and provided with the projection Q,to operate substantially as herein show and destribed.

6. The quadruple valve M, provided with double heads, to close on two pairs of seats and regulate the iiow of air to both ends of the cylinder A, substantially as herein shown and described.

7. The lever P and projection Q, combined with arm T and projection 2, to operate substantially as herein shown and described.

8. The cylinderA, provided with an aperture, o, in its bottom, leading to the air-channel 7, substantially as described, for the purpose of constituting an air-cushion which will retard the operation, as specified.

9. The combination of the air-cylinder A and piston B with the valve M, pump, and plunger H, all arranged to operate substanas herein shown and described.

HENRY DAVIES. Vitnesses:

N. D. HAYMAN,

ALBERT T. Roo'r,

JAMES C. Boor. 

